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# GATE 2022 : Power Electronics Quiz 3

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Question 1

For same commutation circuit parameter & similar voltage supply. Peak current through main thyristor in voltage commutation and current commutation circuit respectively follows the relation.

Question 2

For 60A constant load current in a Current commuted chopper having input supply of 220 V with commutation circuit parameter of 10μH & 30μF. The minimum current rating of auxiliary thyristor required in order to have stable operation is____Amp

Question 3

A voltage commutated chopper is supplied from 200V for a constant load current of 160 Amp with commutation circuit parameter 40μH & 50μF. The voltage across capacitor at 120μsec after auxiliary thyristor triggered____ V.

Question 4

For the load requirement of constant Current of 25 Amp, a voltage commutated chopper is designed with commutation circuit specification of 50μF, 20μH & Ton time of 600μsec which is supplied by input voltage of 230V DC. The effective ON period of the circuit is ____sec.

Question 5

The circuit in the figure is a current commutated dc-dc chopper where, ThM is the main SCR and ThAUX is the auxiliary SCR. The load current is constant at 120 A . ThM is turned on at t = 0 .

The peak values of current through capacitor and through main thyristor ThM will respectively be

Question 6

A current commutated chopper is fed from a source VS. It’s commutating components are L & C. If the load current I0 is assumed constant during the process, then the time difference between auxiliary thyristor turn-off time & main thyristor turn off time.
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